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HomeMy WebLinkAboutSite Utility Study• • • URBAN RIVER NW 7TH Avenue and NW 7th Street Site Utility Study CTE Project No. 05-0211-40 Prepared by: CONSUL -TECH DEVELOPMENT SERVICES, INC. Florida Certificate of Authorization No. 9008 10570 N.W. 27th Street, Suite 101 Miami, Florida 33172 Tel. 305-599-3141 Fax. 305-599-3143 March, 2005 • I. INTRODUCTION The proposed project site is located at the block bound by NW 7th (south), NW 8th Street (north), NW 7th Avenue (west) and NW 6th Avenue (east). The site is currently occupied by an existing 2-story building that will be demolished. The proposed project will include a 19-story residential tower with a parking garage and some retail space. The tower will have a total of 577 residential units and approximately 7,850 SF of retail space. H. DRAINAGE SYSTEM For drainage design purposes, the site will be considered 100% impervious. Landscape and green areas are provided, but these areas will not be considered in the calculations in an effort to be conservative in the storm water management design. Storm water discharge will consist of runoff from rooftops, roadways, vertical building faces and pedestrian areas. Miami -Dade DERM requires that the proposed drainage system take into account 1/3 of the largest vertical building face for the DERM 5-year, 24-hour design stow u only. The building faces exposed to the north will produce the largest amounts of runoff and will be accounted for in the calculations. The site land use can be summarized as follows: Total Net Impervious Vertical Total Lot Area Area Building Faces Drainage Area (Acres) (Acres) (33%) (Acres) (Acres). 4.20 4.20 0.52 4.72 The proposed drainage plan calls for all pavement runoff to be collected in catch basins capable of detaining the peak inflow from the Miami -Dade County DERM 5-year, 24-hour design storm for 90 seconds. These basins also contain baffles to prevent all oil, grease and foreign matter from flowing into the proposed system. The runoff will then flow into eight proposed drainage wells based on calculations found in Table 1. Runoff from building rooftops and vertical faces are uncontaminated by oil and grease and may be piped directly into to the drainage wells. The use of drainage wells is permitted by Dade County DERM in this area due to the high • • level of salinity found in the groundwater. Since the proposed system is using drainage wells to dispose of excess runoff, an exfiltration trench system will be designed to treat the larger of the first inch of runoff generated before disposing of any runoff, or 2.5 inches over the impervious area. The proposed well and exfiltration trench systems will keep the site dry during the DERM 5 years - 24 hours storm, and keep the flooding below the site perimeter elevation during the SFWMD 25 years - 72 hours storm. The 100 years — 72 hours stain' stage elevation should remain just below the FIRM elevation 9.0' NGVD. According to our preliminary drainage calculations, this will the case as long as the project open area is kept at or above 1.34 acres. NW 7th Avenue is a Florida Depaiirttent of Transportation Right -of -Way. According to Department rules, additional calculations must be performed to prove to the Depai tment that there will be no discharge into the State Right -of -Way. The drainage well system will be designed to retain the maximum storm stage of the 100-year, 1, 2, 4, 8, 24, 72, 168, and 240-hour stoiui events. III. WATER DISTRIBUTION MASTER PLAN The Miami -Dade Water and Sewer Department (MD-WASD) provides the water service in this area. Currently, there is a 36-inch water main along NW 8sh street, a 36-inch water main along NW 6th Avenue, a 6-inch water main along NW 7`h Street, and a 12-inch and a 6-inch water main along NW 7th Avenue. Refer to the attached Water Atlas for additional information. According to the Miami -Dade Water and Sewer Rules and Regulations, at least two frontages of the property will have to be covered by a 12-inch water main. Furtheiuuiore, 36-inch or larger mains are not considered to provide frontage on properties. Therefore, we estimate that as a minimum, the MD-WASD will require the construction of a new 12-inch water main along NW 7th or 8th Street. At least two new fire hydrants should be installed on the proposed water main. The anticipated average daily water consumption for the entire project is 115,785 GPD, and is calculated as shown in Table 2. • • IV. SANITARY SEWER MASTER PLAN The Miami -Dade Water and Sewer Department (MD-WASD) also provides the sanitary sewer -service in this area. There is an existing 8-inch gravity sanitary sewer main running along NW 7 Street, a 30-inch and an 8-inch along NW 6th Avenue, an 8-inch along NW 8th Street and an 18-inch along NW 7`h Avenue. Service to the proposed development will be provided by sanitary laterals connected to the existing sewer main surrounding the property. This project is anticipated to generate an average daily sewage flow of 115,785 GPD, and is calculated as shown in Table 2. The wastewater produced by the site will travel via the existing sanitary sewer system to the MD-WASD Regional Pump Station No. 1. Pump station No. 1 is currently operating for 4.87 hours per day. According to DERM, the additional 115,785 GPD flow from this project together with reserved flows from other projects proposed in the area will put the pump station NAPOT at 5.99 hours per day, Thus, the pump station is deemed capable of handling the proposed flow from the project. Pump Station No. 1 transmits all flows directly to the MD-WASD treatment plant on Virginia Key for final treatment before discharge into the Atlantic Ocean. Refer to the attached Miami -Dade DERM projections for more information. V. SOLID WASTE GENERATION Solid waste generated wilt be placed in standardized on -site containers for refuse and recyclables per the City of Miami Code, for regular pickup by private hauling companies and/or the City of Miami Solid Waste Department. The solid waste will then be transported to Miami-Dade's Disposal Facilities. Actual waste pick-up locations will be shown in the architectural plans. This project is anticipated to generate an average daily solid waste volume of 740.5 Cu. Ydlmanth, and is calculated as shown in Table 3. Generation rates were deteu,uined from data provided by the Miami -Dade County Department of Solid Waste. • Total Net Lot Area Total Drainage Area 1. Impervious 2. Pervious TABLE 1 URBAN RIVER DRAINAGE CALCULATIONS = 4.20 Acres = 4.72 Acres .= 100% or 4.72 Acres = 0% or 0.00 Acres 2. Average Runoff Coefficient = 0.98 3. SFWMD Design Storm Information 1. 5-Year 24-Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 6.10 inches per hour Purpose = Flood Protection Peak Runoff = CIA = (0.98)(6.10)(4.72) = 28.22 cfs 2. SFWMD 25 Year - 72 Hour Storm (Miami -Dade County W.C. 1.1) Rainfall Intensity = 7.30 inches per hour Purpose = Perimeter Berm Peak Runoff = CIA = (0.98)(7.30)(4.20) = 30.05 cfs 3. FDOT 100 Year - 1 Hour Storm Rainfall Intensity = 5.00 inches per hour Purpose = Discharge to Biscayne Blvd. Peak Runoff = CIA = (0.98)(5.00)(4.20) = 20.58 cfs • FDOT Design Storm Information Storm Duration 1 Hour 2 Hour 4 Hour 8 Hour 24 Hour 72 Hour 168 Hour 240 Hour 4. Well Data Rainfall Amount (Inches) 5.0 (Figures 5-1 & 5-11) 6.3 (Figures 5-1 & 5-11) 7.8 (Figures 5-1 & 5-11) 9.6 (Figures 5-1 & 5-11) 14.0 (Figure 5-13) 19.0 (Figures 5-14 & 5-15) 20.0 (Figure 5-16) 23.0 (Figure 5-17) 1. Well Diameter = 24 Inches 2. Assumed Well Capacity = 500 gpm/ft. of Available Head 3. Mean High Tide Elevation = 2.00 ft. (taken from W.C. 20,034-A) 4. Specific Gravity Head Loss=_2.00' 5. Proposed Number of Wells = 8 5. Hydraulic Grade Line Elevations at Well Structure 5 Year DERM Storm = (28.22 cfs)/[(500 gpm/ft head)(0.002228 cfs/gpm)(8 wells)] + (2.00 + 2.00) = 7.17' NGVD 2. SFWMD 25 Year - 72 Hour Sto n = (30.05)/[(500 gpm)(0.002228 cfs/gpm)(8 wells)] + (2.00 + 2.00) = 7.37' NGVD 3. FDOT 100 Year - 1 Hour Storm = (20.58 cfs)/[(500 gpm)(0.002228 cfs/gpm)(8 wells)] + (2.00 + 2.00) = 6.31' NGVD • Residential Towers 577 units TABLE 2 URBAN RIVER ANTICIPATED AVERAGE DAILY FLOW OF WATER AND WASTEWATER @ 200 gpd/unit = 115,400 Retail Space 7,700 SF @ 5 gpd1100 SF = 385 Total = 115,785 2Pd ANTICIPATED AVERAGE DAILY FLOW WASTEWATER Average Flow = 0.116 mgd Peak Flow 0.434 mgd NOTES: 1. Peak flow uses a factor of 3.75 times average flow (Recommended Standards for Wastewater Facilities, 1990 Edition) 2. gpd = gallons per day 3. No industrial wastewater is anticipated to be generated 4. rngd = million gallons per day • • TABLE 3 URBAN RIVER SOLID WASTE GENERATION Residential Towers 577 units @ 1.25 cu. yds /month per unit = 721.25 cu. yds./month Commercial and Retail Space 7,700 SF of retail space @ 0.25 cu. yds per 100 SF /month = 19.25 cu. yds/month Total anticipated Solid Waste generation = 740.5 Cu. Yds. !month • WATER ATLAS (MD-WASD) 3750 t,,389 . DW 2000-007 LJ re 2 1 818 51 1110•••.- WiF I AL 813i ir SEWER ATLAS (MD-WASD) NOP 1VR ) 844 --845 84E1 348 815/ 820/ 1 415e ,142so k 1 „ ••. [4217 4. 1 814 • CO 7-822 821 ' . '41as 'r ‘.., .. \ \ \ / 925 .•( \ ..,—_ \ . •., \ .•?...,:' \ • • 15 7 5489 1. 4 25 CO 38`FM • HOP OVER "OF OW R or 11 934 1 ji 994 .„ 71 3312 1 1 NW 8 $T (8007 1 831 12'7 3 26 ST 1 30 6 32 6 v.! • 370e !,1 491 • vri is31 Ei 4o tri ▪ 3709 ;__HA/' 1 I-K3P ovER 834 9, 801. 8007 1 ( 83 83 835 113▪ 704 GS 1-41 23 SITE 24 • 3001 1 -- 31 2 ) 3069 1 2- 5 3088 I 1 80 ! \ i 18007 .! • 411k....-- fi 5848 7 ---• I ▪ 3049 I 53-1 32 51 52 • tr..f etTerr Ih41102fIn240 1 I ------ 4.2 44 —5 •-- 306 • VIIAVII-DADE COUNTY DE RBI Pump Station No.1 Usage and Projections -Pump Station Station..30 -0001 Atlas Pg..F14 MIAMI DADE WATER & SEWER DEPFRTMENT Addr...390 NW NORTH RIVER DR 1-54-41 Sec -Township -Range Genr. ET clnck.Y Telm.% #Pumps. Pump Tgpe.H :3tn C1ass.M Speed.2 Hrspwr. Res fl3uJ(gptl) Plans.. 6,120,087 Plats.. 0 Fxtens. 0 Date Proj Nep0t 41.1..prs 4.87 tars 4.87 hrs % Cep 59.70 48.70 48.70 Ma . NRPOT Avg Deily Flows 01/28/2005 12/28/2004 1/23/2004 /25/2004 /24/2004 08/25/2004 07/27/2004 Ready. • 4.35 30.48 0.00 4.33 30.34 0.00 5.54 38.79 0.00 6.18 43.29 0.00 5.81 40.70 0.00 6.50 45.51 0.00 3,64 25.50 0,00 Signature..3ARCIM Monthly Information NO. 276 <F' '_.2 Review> Moratorium..OK Moratorium effective since / / Yearly NAPOT (hrs) .... 4.87 Stn Gross Capecity(gpd)221,760,000 Station Reduction Factor.. 0.50 Stn Net Cep Ccrtif (gpd) .. 0 Stn Net Capacity(gpd)....L33,056,000 Indicated Flows(gpd) 26.999,280 Rgd # Comments F 1 g Pop Y 8 Y 8 Y 8 Y 8 Y 8 Y 9 Y 8 Sign Date..12/20/2004 17:40:49.89 26, 2 S, 2-8 C0-c. o.Q» 6, tZ©, o8?C pro ec €ek-t t!5,1& 133 O56, ac)<3 = 5, ``.3Y U Yb � S2 i N. env v`' e • Gilberto Pastoriza From: Alexandra [acardenas@argmia.com] Sent: Tuesday, March 29, 2005 12:08 PM To: Gilberto Pastoriza; Tony Recio Cc: 'Chloe Keidaish' Subject: FW: Urban River Utility Report From: Marco Osorio Sent: Thursday, March 24, 2005 5:23 PM To: gpastoriza@wsh-flalaw.com Cc: reiilydevelopment@msn.com; acardenas@argmia.com Subject: Urban River Utility Report Dear Gil, Attached, please find the Utility Report for your MUSP submittal. Please review it and let me know if you have any comments or questions. Sincerely, 1tiarco 4. Osorio, Vice President, Director of Engineering Consul -Tech Development Services, Inc. 10570 NW 27th Street, Suite H101 Miami, FI 33172 Phone (305) 599-3141 ext. 311, fax: (305) 599-3143, e-fax # 1(501) 421-4722 e-mail: mosorio@cte.cc Web: www.cte_cc This is a transmission from the engineering firm of Consul -Tech and is intended only for the use of the addressee. It may contain information which is privileged, confidential andlor protected. if you are not the intended recipient please e-mail the sender and destroy all copies of this message and any attachment. Any disclosure, reproduction, distribution or use of the contents of this message or any attachment thereto is strictly prohibited. 03/29/2005